package Calculator;
//20230404430920沈泽华
public class calculator {
    public static final double pi = 3.14159;
    public static double add(double n1, double n2){
        return n1 + n2;
    }
    public static double subtract(double n1, double n2){
        return n1 - n2;
    }
    public static double circleArea(double r){
        return pi * r * r;
    }
}
